Use racket/class in lieu of mzlib/class
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@ -2,7 +2,7 @@
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#lang frtime
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#lang frtime
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(require frtime/animation
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(require frtime/animation
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frtime/gui
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frtime/gui
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mzlib/class)
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racket/class)
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(define-struct tile (row col num color))
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(define-struct tile (row col num color))
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(define-struct state (tiles blank-row blank-col))
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(define-struct state (tiles blank-row blank-col))
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